Hi Mike,
I've just checked it. All samples have the correct Release value.
What you hear are resonances caused by the musicians itself. The ringing is part of the intervall samples an not the release of the previous sample.
You can proove it (velocity crossfade has to be set OFF), if you perform the D with velocity 1 (piano sample is triggered) and than C or E with velocity 127 (forte sample is triggered) you will hear only the new sample, and everything you hear is part of this new sample, no Release sounding.
What you hear, is the open D string with some overtones which is forced by performing the D on the higher A string, and the D string keeps ringing for some time. So I think it's an authentic and natural effect.
best
Herb